The new site still has some issues, it's normal. Something similar to your problem happened to me too, try first to reload the page or re-enter the battle room, I think this should solve the problem. For any technical problems like this, or bugs reports, please contact the technical support at support-en@urban-rivals.com , the moderators can only report this kind of problems to the staff the same way you do.

Ok....here's how you beat it......you have to re-boot and enter the battle room (you will still appear to be engaged in combat)...challenge another player and wait.The list re-sets with your name in it after the battle/refusal.This ONLY seemed to work after a re-boot.
Thanks to you too Raven.....I wouldn't do things this way except for some reason my mail system comes up with an error everytime I try the support links.